I currently shoot mechanical exclusively and have never had a problem because of them. However, to answer your question, the dislike is because many folks assume that you do not need to tune a bow as well when you shoot mechanicals because they fly with field point accuracy. Totally not true and actually just the opposite. The bow has to be even more accurately tuned otherwise you waste precious KE which is needed to get mechs. to function properly....which is the second reason for the dislike. Many folks buy 1.5 to 2 inch conventional style mech. heads and expect to get excellent performance when their KE levels are way below what most folks considerable acceptable for mech. use.